Electronic Materials Letters , vol. 4, no. 1, pp.1-4, March, 2008

DOI :

Nucleation and Crystallization of Phosphate Glass for a PDP Barrier Rib by Differential Thermal Analysis

Young Seok Kim, Kyu Ho Lee, Tae Ho Kim, Young Joon Jung, and Bong Ki Ryu^*
Pusan National University

Abstract : Non-isothermal measurements with differential thermal analysis were used to study the nucleation and crystallization kinetics of P₂O₅-B₂O₃-ZnO-BaO-Al₂O₃-TiO₂ crystals in bulk glass, particularly with respect to the crystallization that occurs when the glass is heated. The temperature of the nucleation rate was determined by plotting either the reciprocal of the temperature that corresponds to the maximum crystallization peak, 1/T_p, or the height of the crystallization peak, (ΔT)_p, as a function of the nucleation temperature, T_n. The temperature at which nucleation can occur for the glass ranges from 700°C to 890°C and the temperature for the maximum nucleation is 760±5°C. The correct activation energy for the crystallization, E_c, of the glass is the same for the surface crystallization orthe bulk crystallization: namely 533 kJ/mol ± 15 kJ/mol. The analysis of the crystallization data with the Kissinger equation and the Marotta equation yields the correct value of E_c, though the crystal growth occurs only on a fixed number of nuclei. The crystallization process of a sample heat-treated at the temperature of the maximum nucleation rate was fitted to kinetic equations with an Avrami constant (n ≈ 2 ) and the dimensionality of crystal growth (m ≈ 2).

Keyword : crystallization kinetics, phosphate glass, glass-ceramics, surface nucleation